Does one ice bath usually keep the batch cool enough through fermentation (with room temps around 70-72)...or will I need to refresh the ice?
I freeze large-ish sized soda bottles of water, and change them out once a day. I float a thermometer in the water bath (along with a tablespoon of bleach to avoid mold growth in my cooler) and I have a homemade foam lid to insulate it.
Here's a photo: